Asked by krishna
the 10th term of an arithmetic sequence is equal to the sum of 40 and 5th term.If the 15th term is 127 what is its common difference?what is its first term?what is the sum of the first 30 terms.
Answers
Answered by
Steve
a+9d = 40 + a+4d
a+14d = 127
solve for a and d, then find
S30 = 30/2 (2a+29d)
a+14d = 127
solve for a and d, then find
S30 = 30/2 (2a+29d)
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